i found that you can download several applications using skype.com. i hear skype is really cheap if you want the internet service. i went ahead and purchased a pda with all the medical books downloaded into it. i made sure it was up to date. i can add new books and delete the older editions. i have davis drug, mosby's and nursing dx along with many other programs useful for emt and dr's. it has wi-fi and bluetooth so i can search the web and download email. i decided to wait until i get really savy with it before i spend a load for an iphone. i would try to do some research. i had to learn about bluetooth and wi-fi recently.:wink2:
Davis's drug guide is really good and they have a pda version that does not use the internet. I have it on my itouch. You have to be careful that you buy the right one because there are two and one uses the internet. I bought mine right from their website.